fs/gfs2/lops.h

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #ifndef __LOPS_DOT_H__
  11 #define __LOPS_DOT_H__
  12
  13 #include <linux/list.h>
  14 #include "incore.h"
  15
  16 #define BUF_OFFSET \
  17         ((sizeof(struct gfs2_log_descriptor) + sizeof(__be64) - 1) & \
  18          ~(sizeof(__be64) - 1))
  19 #define DATABUF_OFFSET \
  20         ((sizeof(struct gfs2_log_descriptor) + (2 * sizeof(__be64) - 1)) & \
  21          ~(2 * sizeof(__be64) - 1))
  22
  23 extern const struct gfs2_log_operations gfs2_glock_lops;
  24 extern const struct gfs2_log_operations gfs2_buf_lops;
  25 extern const struct gfs2_log_operations gfs2_revoke_lops;
  26 extern const struct gfs2_log_operations gfs2_databuf_lops;
  27
  28 extern const struct gfs2_log_operations *gfs2_log_ops[];
  29 extern void gfs2_log_write_page(struct gfs2_sbd *sdp, struct page *page);
  30 extern void gfs2_log_flush_bio(struct gfs2_sbd *sdp, int op, int op_flags);
  31 extern void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh);
  32
  33 static inline unsigned int buf_limit(struct gfs2_sbd *sdp)
  34 {
  35         unsigned int limit;
  36
  37         limit = (sdp->sd_sb.sb_bsize - BUF_OFFSET) / sizeof(__be64);
  38         return limit;
  39 }
  40
  41 static inline unsigned int databuf_limit(struct gfs2_sbd *sdp)
  42 {
  43         unsigned int limit;
  44
  45         limit = (sdp->sd_sb.sb_bsize - DATABUF_OFFSET) / (2 * sizeof(__be64));
  46         return limit;
  47 }
  48
  49 static inline void lops_before_commit(struct gfs2_sbd *sdp,
  50                                       struct gfs2_trans *tr)
  51 {
  52         int x;
  53         for (x = 0; gfs2_log_ops[x]; x++)
  54                 if (gfs2_log_ops[x]->lo_before_commit)
  55                         gfs2_log_ops[x]->lo_before_commit(sdp, tr);
  56 }
  57
  58 static inline void lops_after_commit(struct gfs2_sbd *sdp,
  59                                      struct gfs2_trans *tr)
  60 {
  61         int x;
  62         for (x = 0; gfs2_log_ops[x]; x++)
  63                 if (gfs2_log_ops[x]->lo_after_commit)
  64                         gfs2_log_ops[x]->lo_after_commit(sdp, tr);
  65 }
  66
  67 static inline void lops_before_scan(struct gfs2_jdesc *jd,
  68                                     struct gfs2_log_header_host *head,
  69                                     unsigned int pass)
  70 {
  71         int x;
  72         for (x = 0; gfs2_log_ops[x]; x++)
  73                 if (gfs2_log_ops[x]->lo_before_scan)
  74                         gfs2_log_ops[x]->lo_before_scan(jd, head, pass);
  75 }
  76
  77 static inline int lops_scan_elements(struct gfs2_jdesc *jd, unsigned int start,
  78                                      struct gfs2_log_descriptor *ld,
  79                                      __be64 *ptr,
  80                                      unsigned int pass)
  81 {
  82         int x, error;
  83         for (x = 0; gfs2_log_ops[x]; x++)
  84                 if (gfs2_log_ops[x]->lo_scan_elements) {
  85                         error = gfs2_log_ops[x]->lo_scan_elements(jd, start,
  86                                                                   ld, ptr, pass);
  87                         if (error)
  88                                 return error;
  89                 }
  90
  91         return 0;
  92 }
  93
  94 static inline void lops_after_scan(struct gfs2_jdesc *jd, int error,
  95                                    unsigned int pass)
  96 {
  97         int x;
  98         for (x = 0; gfs2_log_ops[x]; x++)
  99                 if (gfs2_log_ops[x]->lo_before_scan)
 100                         gfs2_log_ops[x]->lo_after_scan(jd, error, pass);
 101 }
 102
 103 #endif /* __LOPS_DOT_H__ */
 104